Pre-Requisites:
#0.highly recomanded clockworkrecovery mode(download file from below)
#1.You should fully backup your Android device before updating it.
#2.You should enable USB debugging on your device, to activate USB Debug
go to “Settings>Developer options” and check the USB debug option
box.
#3.battary must be charged atlist 70%Here we go update : Step 1: First of all, download ROM Manager App from Google Play Store on your Device and install the same.
Step 2: Now, open ROM Manager App and tap on “Reboot into Recovery” to boot your device into Recovery Mode.
Step 3: Next, from the main recovery menu, select “wipe data/factory
reset” and “wipe dalvik cache” to clear all the cache data’s on your
phone.
Step 4: Now, from the main recovery menu select “install zip from
sdcard” and then select “choose zip from sdcard” and then select the
“Android 4.2.2 Jelly Bean Megamax Custom ROM” file you’ve placed on the
SD Card.
Step 5: As soon as the ROM file has been flashed, flash the Google Apps
Package in the same manner as you’ve flashed the ROM file.
Step 6: When the installation process has completed, select “+++++Go
Back+++++” and then select “reboot system now” to reboot your phone.
Download filesclockworkrecovery imageAndroid 4.2.2 Jelly Bean Megamax Custom ROMGoogle Apps
Warning: though its a custom
rom so Neither we nor the developer will hold any responsibility if you
damage or brick your phone in the process of abow article. Therefore,
so please proceed carefully and at your own risk.